[R] xlab with text and expression

[threshold]

One more question, given that
plot(rnorm(1),rnorm(1), ylab=expression(a~b >= 3), cex.lab=1.2)

then sign >= seems to be smaller than the rest, seems like cex.lab=1.2
affects only the text in ylab. 

1) Is there any way to alter its size to follow the size of the whole
expression? It works nice for legend but not for ylab.
2) Is there any other way to put text into expression? since if you put
ylab=expression(a:~b >= 3) then an additional space pops up between 'a' and
':'.

thanks a lot, robert
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